magnum/doc/source/user/heat-templates.rst

Heat Stack Templates are what Magnum passes to Heat to generate a cluster. For each ClusterTemplate resource in Magnum, a Heat stack is created to arrange all of the cloud resources needed to support the container orchestration environment. These Heat stack templates provide a mapping of Magnum object attributes to Heat template parameters, along with Magnum consumable stack outputs. Magnum passes the Heat Stack Template to the Heat service to create a Heat stack. The result is a full Container Orchestration Environment.

magnum.template_definitions